mips n64 ioctl micro-optimization

[Alexandre Oliva]

I learned yesterday that there's a more efficient way to do
sign-extension from 32 to 64 bits in mips.  This patch brings the
improvement to the newly-added ioctl syscall wrapper.  Ok?

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-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                 aoliva@{redhat.com, gcc.gnu.org}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist                Professional serial bug killer